Rotary valve for steam-engines.



PATENTED AUG. 7, 1906.

J. GQJOHNSON. a

ROTARY VALVE FOR STEAM ENGINES. APPLICATION FILED AUG. 18, 1905.

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PATENTED AUG. 7, 1906.

J. G. JOHNSON. ROTARY VALVE FOR STEAM ENGINES.

APPLICATION FILED AUG. 18, 1905.

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, UNITED STATES PATENT oFFroE.

JOHN G. J OHNSON,

OF TITUSVILLE, PENNSYLVANIA, ASSIGNOR OF ONE- ROTARY VALVE FORSTEAM-ENGINES- Specification of Letters Patent.

Patented Aug. 7, 1906.

Application filed August 18,1905. Serial No- 274,660.

To all whom it may concern.

Be it known that 1, JOHN G. JorrNsoN, a subject of the King of Swedenand Norway, residing at Titusville, in the county of Orawford and Stateof Pennsylvania, have invented certain new and useful Improvements inRotary Valves for Steam-Engines, of which the following is aspecification.

This invention relates to improvements in a rotary valve forsteam-engines; and it consists in certain peculiarities of theconstruction, novel arrangement, and operation of the various partsthereof, as will be hereinafter more fully set forth and specificallyclaimed.

The principal object of the'invention is to provide a rotary valve to beused with various types of steam-engines, which shallbe simple andinexpensive in construction, strong, durable, and efficient inoperation, and which shall be so made as to render it less liable to getout of order than such devices as have been heretofore constructed.

Other objects and advantages of the invention will be disclosed in thesubjoined description and explanation.

In order to enable others skilled in the art to which my inventionpertains to make and use the same, I will now proceed to describe it,referring to the accompanying drawings, in which Figure 1 is a face viewin elevation of the cylinder of an engine, showing my invention appliedthereto and illustrating by dotted lines the positions to which thecontrollinglever may be moved in the operation of reversing the engine.Fig. 2 is a detached inner face view of the oscillating valve. Fig. 3 isa face view of the cylinder of the engine with the controlling-lever andoscillating valve removed. Fig. 4 is a plan view, showing the top plateof the steam-chest and the controlling-lever omitted. Fig. 5 is avertical central sectional view taken on lines 1 1 of Fig. 1 and 2 2 ofFig. 3 looln'ng in the direction indicated by the arrows. Fig. 6 is aver tical sectional view taken on line 6 6 of Fig. 3 looking in thedirection indicated by the arrows, and Fig. 7 is a plan view of thecylinder with the top head-plate and the steamchest thereof removed.

Like numerals of reference refer to come sponding parts throughout thedifierent views of the drawings.

The reference-numeral 10 designates the engine-cylinder, in which islocated a piston 11, having a piston-rod 12 connected at one of its endsthereto, the other end of which may be connected to a suitable part.(Not shown.) One end of the cylinder 10 is provided on its exterior witha transverse enlargement 13, the upper surface of which is flat andsubstantially rectangular in shape and is employed to form a support forthe steam-chest and seat for the slide-valve therein. The wall of thecylinder directly beneath the enlargement 13 or in alinement with saidenlargement is provided with a boss or enlargement 14., the face ofwhich is circular and flat to form a seat for the oscillating valve, aswill be presently explained. The boss or enlargement 14 is provided withtwo steam-chambers 15 and 16, located side by side when theengine-cylinderis in an upright position, as shown, and for convenienceof description the parts will be referred to as if they were applied toan upright engine; but

it will be apparent that the cylinder may be located in a horizontalposition or otherwise.

The chamber 15 has at its upper end a port 17 and at its lower end aport 18, while the chamber 16 has at its upper end a port 19 and at itslower end a port 20, which ports are located in the face of theenlargement 14 or seat for the oscillating valve. Leading from the upperends of the chambers 15 and 16 are channels 21 and 22, respectively,which communicate through ports 21 and 22*, respectively, in the seat 13of the sliding valve with the steam-chest or slide-valve casing 23,which may be of the ordinary or any preferred construction, but ispreferably rectangular in shape and has communicating with one of itsends an inlet or induction pipe 24, through which the steam is passed tothe engine from the boiler. Located between the ports 17 and 19 in thevalve-seat '14 is a port 25, from which a channel 26 leads into theupper portion of the cylinder. Located between the ports 18 and in thevalve-seat 14 is a port 27, which has communication through a channel 28with the lower portion of the cylinder.

Located between the ports 21 and 22 of the slide-valve seat 13 is a port29, which communicates through a channel 30 with the exhaust-pipe 31,which is secured in a suitable opening in the face of the enlargement 13or seat for the slide-valve. Fulcrumed at its lower end on theexhaust-pipe 31 is acontrolling-lever 32, which is provided with agrip-lever 33 and rod 34 to engage the teeth of a segmental rack 35,which is horizontally mounted on uprights 36, secured to thefront'portion of the steam-chest. Extending horizontally from the faceor front portion of the steam-chest and at the opposite end thereof fromthe steam-supply pipe 24 is a slotted arm 37 for the reception andoperation of a rod 38, which is secured on one end of a rod 39, which ismovably and longitudinally located in the steam-chest and is connectedto the slide-valve 40, seated on the valve-seat 13, and which valve isprovided on its lower surface with a cavity 41. Connected at one of itsends to the arm 38 is a link 42, the other end of which is pivotallyconnected to the controlling-lever 32 at a suitable point above itsfulcrum.

The enlargement or seat 14 for the oscillating valve is provided at itscenter with a screw-threaded stem 43, on which is loosely mounted theoscillating valve 44, which is held in contact with its seat 14 by meansof a spring 45, surrounding said stem, and a nut 46 on the outer end ofthe stem. The inner surface of the valve 44 is provided with recesses 47and 48, located diametrically oppo site each other, and are of.sufficient size to unite when the valve is turned to the proper positiontwo of the ports in the upper and ower groups thereof in the seat 14 forsaid valve, which is provided on its outer surface with a wrist-pin 49,to which is connected one end of an eccentric-rod 50, the other end ofwhich is connected to the crank-shaft (not shown) of the engine.

From the foregoing and by reference to the drawings it will be seen andclearly understood that when the controlling-lever 32 is in a verticalposition, as shown in Figs. 1 and 5, the slide-valve 40 will close allof the ports in the valve-seat 13, thus shutting off the flow of steamto the cylinder and preventing the operation of the, engine. By movingthe lever 32 to the position shown by dotted lines at 32 in Fig. 1 ofthe drawings it is apparent that the slide-valve 40 will be moved so asto open the port 21 and close the ports 22 and 29 in the seat 13, thuspermitting steam to pass through the channel 21 into the chamber 15,when in the operation of the oscillating valve 44 the recesses 47 and 48thereof will afiord by-passes alternately for the ports 17 and 25 in theupper part of the valve-seat 14 and the ports 18 and 27 in the lowerpart thereof, thus permitting the steam to pass through the channels 26and 28 alternately, so as to drive the engine in one direction. Bymoving the lever 32 from the position shown by dotted lines at 32 tothat shown by dotted lines at 32 in Fig. 1 the slide-valve 40 will bemoved so as to cover the ports 21 and 29 and to open the port 22 in itsseat, thus permitting the steam to pass thr ugh the channel 22 into thechamber 16 when in the operation of the oscillating valve 44 itsrecesse47 and 48 will afford by-passes alternately for the ports 19 and25 in the upper portion of the valve-seat 14 and for the ports 20 and 27in the lower portion thereof, thuspermitting the steam to passalternately through the channels 26 and 28 into the cylinder, therebydriving the engine in the opposite direction.

Having thus fully described my invention, what I claim as new, anddesire to secure by Letters Patent, is-

The combination with an engine-cylinder having a pair of steam-chamberseach provided with an inlet-channel, of a steam-chest located at one endof the cylinder and having an inlet for steam, a seat for an oscillatingvalve located outwardly from said steamchambers and provided with portscommunicating with each end of each of said chambers, said oscillatingvalve-seat also having intermediate ports in communication with thecylinder near its ends, an oscillating valve mounted on the seattherefor and provided on its inner face with recesses, and means tooscillate said valve, substantially as described.

. JOHN G. JOHNSON. Witnesses:

GEO. A. CHASE, LARS J. CEDER UIST.

